Superior Quality: Made of high-hardness chrome-molybdenum steel for long tool life. It is robust, more durable, and more corrosion-resistant. Metric Sizes: 9 mm, 10 mm, 11 mm, 12 mm, 13 mm, 14 mm, 16 mm, 17 mm, and 19 mm. 【Precision Design】 – Internal threading with reverse spiral splines to bite and provide maximum gripping power; the more you turn, the tighter the grips. Multiple Uses: Specially reinforced sockets with corrosion protection are designed to remove damaged bolts, screws, and nuts. Organized Storage: All extractors are neatly packed in a heavy-duty blow-molded case for safe storage and easy transport.